Set-works for saw-mills



('No Model.) 3 Sheets-Sheet 1.

D. CHASE. v, Set Works for'Saw Mills. No. 240,659.;

Patented April 26 I881.

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' ('No Model.) 3 Sheets-Sheet 2..

v D. CHASE.

Set Works for Saw Mills. NO. 240,659. Patented April 26,1881.

161M %%/aw N. PEI'ERS, PHOTO-LITHOGRAPHER, WASHINGTON, 0.6,

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(No Model.)

D. CHASE. Set Works forsaw Mills.

Patented April 26,1881.

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N.PEI'ER5, FHOTOJ-ITNOGRAPHER, WASHINGTON, D. C.

UNITED STATES PATENT OFFICE.

DENISON CHASE, OF ORANGE, MASSACHUSETTS.

SET-WORKS FOR sAw'- MILLS.

SPECIFICATION forming part of Letters Patent No. 240,659, dated April 26, 1881, Application filed January 29, 1881. (No model.)

To all tchom it may concern:

Be it known that I, DENISON CHASE, a citizen of the United States, residing at Orange, in the county of Franklin and State of Massachnsetts, have invented certain new and useful Improvements in Set-Works for Saw-Mills and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form apart of this specification.

This invention relates to the set-works of circular saw-mill machinery; and it consists, first, in the combination with the ordinary feed ratchet-wheel and set-shaft, and hand-lever operating them, of an additional ratchetwheel mounted loosely upon the shaft and engaging the first by means of two intermediate pinions fixed upon a common hub, or by other suitable means, whereby, by the aid of an additional pawl carried by the hand-lever and operating with the teeth of the auxiliary ratchetwheel, the latter when active imparts rotary motion to the primary ratchet and the shaft in a direction the reverse of that effected by such primary ratchet by moving the hand-lever in the same direction, the main purpose of my improvement being to enable the traverse of the head-block in both directions to be effected by a forward pull upon the lever, as distinguished from the method now in general use effecting the backward movement of the'said head-block by pushing the lever in the same direction.

My invention further consists in the combi-. nation, with the set-shaft lever and the two ratchets and their pawls, of a circular index or scale of inches supported upon a column erected upon the head-block and connected with and rotated bytheset-shaft,and operating with a fixed point secured to the pedestal, the scale of inches and fractions thereof of the index corresponding to the teeth of the primary ratchet-wheel, and the connection be:

' tween the index and set-shaft being so adjusted that a one-tooth movement of such ratchet effects a rotary advance of the index part of the pointer to the extent of one of the subdivisions of such index, and of a greater number of teeth in the same proportion.

In the accompanying drawings, Figure 1 represents a vertical cross-section through a part of my operating-lever and myinternallygeared wheels, with some of the neighboring mechanism. Fig. 2 represents a side view of said devices with some parts which are not shown in Fig. 1. Fig. 3 represents a vertical longitudinal section through the mechanism embodying my invention. Fig. 4 represents a front view of my dial and index and some of the operating mechanism. Fig. 5 represents a side view of the dial and index, with the supporting and operating devices. Fig. 6 represents avertical section through the same. Fig. 7 represents, in detail, the devices for lifting out of engagement the pawl which sets the head-block forward; and Fig. 8 represents a plan view of the entire mechanism embodying my invention.

In these drawings, A represents the horizontal set-beam of the traveling carriage B, which supports the main portion of the setworks, while the front and rear beams of the stationary frame, which upholds the carriage, are shown, respectively, at G D, and the transverse ways upon which the carriage slides at E E, 8210. l

The set-shaft, so-called, is shown at F as journaled in bearings secured to the carriage, while the pinions, secured to this shaft, and operating with corresponding racks upon the tops of the ways, are shown at G G, &c.

The primary ratchet-wheel is shown at b as secured to and rotating at all times withthe set-shaft, while the hand-lever, which is forked at bottom and straddles the wheel and is pivoted to the set-shaft, is shown at H.

The push-pawl, carried by the hand-lever and engagingthe peripheral teeth a a, &c., of the ratchet-wheel b, is shown at d as weighted, and secured at its base to a horizontal rockshaft, h, spanning the arms 8 sof the fork of the hand-lever above the wheel b, while the dog, which prevents backward slip of the ratchetwheel, is shown at f as pivoted at its base or hub b to a horizontal pin or Stud, 0", carried by a rigid arm or bracket, d, extending rearward from the set-beam A and in rear of the wheel b and outside of the hand-lever, the pawl d extending forward from the shaft h.

e in the drawings represents a curved arm united at its lower end to the hub 1/ of the dog f, this arm springing upward over the teeth of the ratchet b and passing through the fork of the hand-lever and resting upon the top of the free end of ahorizontal cam, t, which is disposed outside of the adjacent arm 8 of the hand-lever, and is secured at its base to the end of the rock-shaft it, before named, the arrangement of the arm 0, dog f, and cam It being such that as the pawl d is lifted in the act of disengaging it from the ratchet b the rock-shaft h is rocked and the cam t elevated, thereby elevating the lifter-arm c and disengaging the dog f also from the ratchet b.

To elevate the weighted pawl d a vertical rod, 1, is employed, the lower end of which is connected with the free end of the pawl, and the upper end of which is connected with. the lower end of an arm,u, depending from a horizontal rod or bar, 1;, this rod or bar a; being swiveled at its rear end to the top of the handlever H, and terminating at its front end in a suitable handle.

To disengage the pawl d and dog fpreparatory to throwing back the hand-lever to take renewed hold of the wheel I), the sawyer seizes the handle of the bar 12, and, by a trivial motion of the latter, lifts, by means of the rod 1, the pawl d, and, through the latter and the cam t and arm a, disengages the dog.

The above constitutes aportion of a saw-set mechanism heretofore in general use, and in which, as before stated, the backward movement or traverse of the carriage is obtained by throwing the hand-lever H in the same direction.

To adapt the hand-lever to retract the carriage by a forward movement or pull I proceed as follows: 0 in the accompanying drawings represents a second ratchet-wheel, substantially of equal size with its companion I), such wheel 0 being located within the fork of the hand-lever and having an integral axial hub, to, which loosely encompasses the setshaft F, this hub protruding beyond the inner face of its wheel and meeting the inner face or hub a; of the wheel I), as shown in Fig. 1 of said drawings. The periphery of the wheel 0 is converted into a rack of ratchet-teeth of equal size, but preferably of greaterlength than those of the wheel I), while upon the inside of the rim y of said wheel 0,1 form an annular concentric toothed-rack, 2. Furthermore I provide a short shaft or barrel, 19, upon each end of which I cast or affix a toothed pinion, 0, or 0 and I mount this shaft in one end of a bracket or bearing, 6, projecting rearward from the setbeam A, as shown in Fig. 3 of the drawings, and with its pinion 0 engaging the annular rack of the wheel 0. The opposite pinion 0 of the barrel p engages a spur-gear, f, formed upon the hub w of the wheel I), and in order that a rotation or advance of the wheel 0 about the shaft F may advance the wheel I) and said shaft in one direction with an accelerated motion, the pinion 0 is of larger diameter than that of the pinion o To complete the details of mechanism which I employ to efiect the reverse movement of the set-shaft, I provide a drag-pawl, which is shown at g in the drawings, andis secured at its base to the rock-shaft h, such pawl extending rearward over the teeth of the wheel 0 and engagin g such. teeth with its book 9. w

The operation of the entiredevice is as follows, it being understood that the parts are in position with the hand-lever pulled forward to its fullest extent, and resting against the abutment, which determines the extent of its forward movement, the pawl d and dog f being in engagement with the ratchet-wheel I), and the pawl 9 free from engagement with the opposite wheel, 0.

If it is desired to set the carriage forwardthat is, nearer the saw-the sawyer seizes the handle of the rod c and pushes the hand-lever until the number of teeth corresponding to the desired thickness of the stuff to be sawed are passed over by the pawl cl, when a pull of the lever forward rotates the wheel I) and set-shaft F and advances the carriage to a corresponding extent.

When it is desired to set the carriage backward preparatory to receiving a new log, or for any purpose, the sawyer twists the rod 4;, and

in so doing disengages the pawl 01 and dogf from the ratchet-wheel b, at the same time, by rotating the shaft h, throwing the drag-pawl g into engagement with the ratchet-wheel c. The hand-lever is now pushed backward as at first until the pawl g has passed over the desired number of teeth upon the wheel 0, when it is pulled forward as at first, but with entirely different results, as the pinion 0 being rotated by the pinion 0 and the annular rack of the wheel 0, acts upon the gear of the wheel I) to rotate the said wheel in a direction opposite to that first explained, thereby rotating the shaft F also in areverse direction and causing arearward movement of the carriage upon the head-blocks.

It will thus be seen that both the backward and forward movements of the carriage are effected by a forward pull upon the hand-lever, the wheel 0 being brought into or thrown out of action by a semi-rotary movement of the rod r.

The register before alluded to is shown as composed of an upright thin annular plate or wheel, J, secured at its axis to the front end of a horizontal stud, i, which is mounted in a head or hub, j, swiveled, as shown, at k to the top of a tubular vertical post or standard, K, erected upon a bracket, L, extending rearward from the beam A and to the right of the sawyer. The head 9" terminates at top in a vertical post, N, which at its upper end has a lateral horizontal arm, I, from which a pointer,

m, depends in front of the wheel, and operates in connection with an annular scale, a, of divisions upon the front of the rim of the wheel. The scale a is divided into equal divisions, which represent inches, and each inch-space is subdivided to represent fractions of an inch, (in the present instance halves and quarters,) and these smallest fractions of an inch correspond in number with teeth, or a given-number of the teeth of the ratchet-wheel b, in order that a onetooth movement or more of such wheel shall effect a corresponding movement of the index-wheel past the pointer, allowance being made for the saw-kerf in circulating the length of the divisions of the scale.

To rotate the index-wheel I affix to its rear side a bevel-gear, 0, which is engaged and driven by a second bevel-gear, p, affixed to the upper end of a vertical shaft, g, which is contained within the bore of the standard K and protrudes beyond the lower end, a bevelgear, r, which engages and is driven by a fourth bevelgear, 8, secured to the set-shaft F, before alluded to.

The gear 8 is secured to the shaft F by a set-screw or otherwise, in order to permit of bodily adjustment of the index-wheel upon the standard K,with respect to the sawyer, for the purposes before explained.

The scale upon the index-wheel is of such length or extent as to permit of the entire traverse of the carriage upon its ways without any one division passing the pointer twice during such traverse, and when the carriage effects its rearward movement the reverse rotation of the set-shaft F restores the indexwheel to its zero or starting point.

Having thus explained the nature and purposes of my invention, I claim, and desire to secure by Letters Patent, the following:

1. In combination, the primaryratchet-wheel fast upon the set-shaft, and having a peripheral toothed rack upon its hub, the auxiliary ratch' et-wheel upon said set'shaft and having an annular toothed rack upon the interior of its rim, and the intermediate barrel with its two pinions, one of which engages the toothed rack upon the hub of the primary ratchet, and the other the annular toothed rack upon the interior of the-auxiliary ratchet, the barrel being mounted in a stationary bracket or support upheld by the carriage, and the whole operatin g as before described.

2. In combination,the primary ratchet fast upon the set-shaft, the auxiliary ratchet loose upon said shaft and connected by mechanism, substantiallyas described, in a suitable manner, with the first to put it and the shaft in rotation, the hand-lever pivoted to the shaft, the two pawls d and g, pivoted to said lever, and the dog f, pivoted to a fixture of the carriage, substantially as explained. i

3. The combination of a set-shaft, a geared ratchet-wheel fast thereon, an intern ally-gea red ratchet wheel loose thereon, a gearing connectin g said Wheels and communicating reverse motion from the latter to the former, a pair of pawls each turning one of said wheels in the same direction, a shaft supporting both of said pawls, and a lever which is connected with said shaft and operates either of said pawls by a forward motion.

4. The combination of a swiveled rotary dialplate'with a fixed index or pointer, a supporting-pedestal, a vertical shaft geared with said plate to rotate the same, and gearing for antomatically operating said shaft to effect the desired register.

In testimony whereof I affix my signature in presence of two witnesses.

DENISON CHASE.

Witnesses:

RUFUs D. CHASE, CHAR-LES F. GHAsE. 

